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Patent US3420120A successfully refreshed from Google Patents.
US3420120A
Expired / Lapsed
US
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Gear drive systems
Assignee: DAVID S BURTNER
•
Filing: 1966-09-06
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Granted: 1969-01-07
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Expires: 1986-09-06
Abstract
No abstract record available.
Inventors
- 👤 David S Burtner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:53
CPC Classifications
F; F16; F16H; F16H48/00; F16H48/20; F16H48/27; F16H48/06; F16H48/08; F16H2048/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB708714A
Cited
US2775141A
Cited
US2883884A
Cited
US2869399A
Cited
US3099926A
Cited
US3211022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |